Malicious PDF — malware analysis report

Static analysis result for SHA-256 403dce4c59ba49c4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-06 08:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 194c823f386214562a4f514c1ae59aeb SHA-1: 0356e54572341dfc27f5219027b9989c8e322e51 SHA-256: 403dce4c59ba49c408882fee9ab1ea2d7d3162194a12709892ac2e427e667bf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/b14076b0e0622ddbc10557d844678800/vodonebuke.pdf In PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69500064278.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/riwuxakiruvunumomipa.pdfIn PDF document text
    • https://brs.jo/userfiles/files/kudivag.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/29959925879.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/vajumosa.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/8260324483.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/48389199065.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/redujezekitiledi.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608acea8e6157---gujepuxomerugojekivoti.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/h6ao3qfb7ltci5bnq4abs6su7l/buvirukamefimibu.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/zemuxegijiwulekotunu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e46073a3f5---bedizipol.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ojd6m2ehcrva20bj42a5rt7jfs/5188261586.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/12859597668.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7qjkd9euapep6bf9amgkias3v6/remir.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/79868624990.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/if2l62lje74mr780us7cuu7hb7/48822467781.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/64736519758.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/43887f96a4f2b39302b15fb783319f69/silalezufozanopodigosoz.pdfIn PDF document text
    • https://fishboat.hr/files/80697271878.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9836f810dc---49345515032.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/nutanafidepopewebepumuj.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210709_EEBE4C84B0C627E9.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=windows+hardening+checklist+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC92 15160 bytes
SHA-256: 9a1d23c877dd3a0b926095162e2201bc65d61013289936389850b4d513e349aa
font_02_sfnt_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 11072 bytes
SHA-256: c4d94eaf8773260f4b9a8f9cf91b5d3ffaee2b17cdb17b22adba226336375b30

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